Bag making machine



Feb. 2, 1937. A. POTDEVIN 2,069,592

I BAG MAKING MACHINE Filed Nov. 20, 1934 2 Sheets-Sheet 1 INVENTOR WWW BY $4 M -QW.

ATTORNEYS Feb. 2, 1937. A, TDE 2,069,592

BAG MAKING MACHINE Filed NOV. 20, 1934 2 Sheets-Sheet 2 p 'INVENT9R R KM; MZZM ATTO RN EYS Patented F ch. 2, 1937 UNITED STATES PATENT OFFICE BAG MAKING momma Adolph Potdevin, Garden City, N. Y., assignor to Potdevin Machine Company, Brooklyn, N. Y., a corporation oi New York Application November 20, 1934, Serial No. 753,819

8 Claims. (Cl. 93-33) This invention is directed to an improvement in bag making machines and the like and is of this mechanism with respect to the forwarding rolls, pinch rolls, etc.

In the drawings:

Fig. 1 is a part sectional side elevational view of an embodiment of my invention; and

Fig. 2 is a plan view.

Referring to the drawings in detail, the tubed material designated I is fed through the machine by forwarding rollers, one pair of which I have shown at 2, and along a former-plate 3, one wall or ply in the case of multi-ply tubes passing below this plate, the other walls or plies passing over the plate as is customary.

Cooperating with the former-plate 3 is a cutoff plate 4, this cut-off plate lying above the former-plate and slightly to the rear thereof so that when the tube is severed, a flap will be provided at each end of the bag length, as shown at 5.

Beyond the former-plate 3 and the cut-off plate 4 are pinch rollers 6 and I and the forwarding rollers 8, 9 and l3, l4.

Mounted at one side of the machine is a large diametered spoked ring or disc I0 rotatable on shaft l0 located preferably above the paper line about an axis transverse of the direction of travel of the bag making material, this ring or disc having at least two striker bars II and I2 attached to its periphery. These striker bars which are shown evenly spaced on the ring or disc l0, extend transversely of the machine parallel to the axis of rotation of the ring or disc, and are of suflicient length to intersect the path taken by the material I and to cooperate with the former-plate 3 and cut-ofl' plate 4 successively to sever the tubing I into bag lengths. The ring or disc I0 is so timed that as a striker bar is brought into position to sever the tubing the latter will be held by the pinch rollers 8 and I to provide the desired slack in the paper for the cutting-off operation and the other striker bar will be ready to cross the path of a previously severed tube without coming in contact with the leading end of the last severed tube.-

While I have shown two striker bars carried by the ring or disc l0 it will be appreciated that this number may be varied as desired, any change in the number of striker bars requiring merely proper timing of the machine so that a striker bar will arrive at the cutting of! station at the proper instant with respect to the position of the pinch rolls 6 and I and another striker bar will be ready to pass below the tube or paper line without interfering with the leading end of the previously cut-off tube length.

From the above description it may be seen very clearly that there is a distance of at least more than one tube length between the point of tube severing by one striker bar and the point of recrossing the paper line of another striker bar.

The severed tube lengths are successively forwarded to the bottom-forming cylinders l5 and It by the rollers 8 and 9 and I3 and M, the leading edge of segmental roller 8 cooperating with roller 9 takes hold of the advancing tube at the very moment when the same is released by the bar 6' in pinch roller 6. Segmental roller 8 and roller 9 forward the tube lengths to the forwarding rollers l3 and It, the segmental roller l3 cooperating with the roller It takes hold of the advancing tube before the same is released by the rollers 8 and 9, and in turn forward the traveling tube in properly timed relation to the bottom-forming cylinders l5 and Hi.

The diameter of the ring or disc I0 is such that the striker bars II and I! pass between the forwarding rollers l3 and I4, and bottom folding cylinders l5 and it on their return travel without interfering with the advancing tube.

As each tube length is fed forward by the rollers l3 and I4 to the bottoming rollers 15 and It the tube lengths are released from between the bite of rollers l3 and M by the proper timing of the segmental roller l3, the following edge of which releases the tube when the same is taken hold of by the bottom clamping gripper ll, on roller l6, and the tucker knife l8, on roller I5.

It will be seen from all the foregoing that I have provided a machine in which the striker or cutting-off bars are mounted on a rotatable ring or disc and cooperate with cut-oil mechanism mounted to one side of the plane of rotation of the cutters; and that the cutting-oil bars are moving in a circle of sufliciently large diameter to obtain the required striker bar speed to cut off or sever all of the tube lengths for which the machine is designed eiilciently, with all points of the cut-off bars moving at the same relative speed and with the cut-off bars on their return stroke traversing the tube or paper line at more than one tube length from the severing point of the tube lengths without interfering with the progress of the advancing tube lengths.

It is to be-understood that changes may be made in the details of construction and arrangement of parts herein described within the purview of my invention.

What I claim is:-

1. In a bag making machine, the combination of mechanism for forwarding the bag material, including a pair of pinch rollers, a rotatable ring or disc rotatably mounted to one side of the advancing bag material, a striker bar carried on the periphery of the said ring or disc of sumcient length to intersect the path taken by the advancing bag material, said disc and pinch rollers being so timed that as the striker bar is brought into operative position with respect to the advancing material the latter will be engaged by the pinch rollers to retard the bag material, and the axis of rotation of said ring or disc being so disposed with respect to the bag material that the striker bar will be traveling rearwardly with respect to the direction of travel of the bag material when it engages the bag material.

2. In a bag making machine, the combination of a rotatable ring, a striker bar mounted on the ring and extending parallel to the axis of rotation of the ring, and plates extending toward said ring and cooperating with said bar, the axis of rotation of said ring being above the line of travel of the bag making material and above said plates, whereby the striker bar engages the bag making material as the same is advancing through the machine and is brought into operative posit-ion with respect to said plates while moving in an arcuate path and rearwardly as compared with the forward advance of the bag making material.

3. In a bag making machine, the combination of a former-plate, forwarding rollers for advancing tubular bag making material continuously along said plate with one wall of the tube passing along the lower face of the former-plate and the other wall along the upper face of the plate, a cut-off plate above the former-plate, a rotatable ring driven about an axis transverse to the direction of travel of the bag making material, striker bars carried at the periphery of the said ring and extending parallel to the axis of rotation of the ring, said ring being offset with respect to said cut-off plate and being of such diameter as to carry said striker bars into cooperative relation to said former-plate and cutoff while moving rearwardly as compared with the forward advance of the bag making material successively to sever the bag making material into bag lengths.

4. In a bag making machine, the combination of forwarding rollers, pinch rollers for slowing the progress of the bag making material through the machine to provide a slack therein, a ring driven about an axis transverse to the direction of travel of the bag making material, striker bars carried by said ring and extending parallel to the axis of rotation of the ring, said ring being mounted off center with respect to the line of travel of said bag making material and being so timed with respect to the forwarding rollers and pinch rollers as to bring a striker bar into cooperative relation to the bag making material while there is a slack in the bag making material and while the striker baris moving rearwardly as compared with the forward advance of the bag making material, successively to sever the bag making material into bag lengths.

5. In a bag making machine, the combination of tube advancing mechanism, a rotatable ring or disc at one side of the advancing tube, severing mechanism carried by said rotatable ring or disc and comprising striker bars carried by the disc and extending transversely of the machine, said striker bars being of suillcient length to intersect the path taken by the advancing tubing,

and a shaft at right angles to the line of travel.

of the tube located above the tube line and supporting said ring or disc, said striker bars engaging the tubing while moving rearwardly as compared with the forward advance of the bag making material.

6. In a bag making machine, the combination of mechanism for advancing the bag material. a rotatable ring or disc mounted to one side of the advancing material, aplurality of striker bars carried by said ring or disc, said bars extending transversely of the machine, and being of suilicient length to intersect the path taken by the advancing bag material, successively to divide the material into bag lengths, the axis of rotation of said ring or disc being so disposed with respect to the bag material that the striker bars will be traveling rearwardly with respect to the direction of the bag material when they engage the bag material, pinch rollers for retarding the advancing material when the latter is intersected by any one of said striker bars, said ring or disc being so timed that another striker bar will cross the path of a previously severed tube without contacting the leading end of the last severed tube or bag length.

7. In a bag making machine, the combination of mechanism for advancing the bag material, pinch rollers for intermittently retarding the bag material, a rotatable ring or disc mounted to one side of the advancing material, striker bars carried thereby, said disc being so timed that a striker bar will arrive at the cutting-oi! station during the retarding of the bag material by the pinch rollers, whereby the advancing bag material will be divided into successive bag lengths, the axis of rotation of said ring or disc being so disposed with respect to the bag material that the striker bars will be traveling rearwardly with respect to the direction of travel of the bag material when they engage the bag material, the striker bars being so relatively disposed that as one arrives at the cutting-of! station another will be ready to pass through the line of travel of the bag material without engaging the leading end of the previously cut of! bag length.

' 8. In a bag making machine, the combination of mechanism for advancing the bag material. a disc or ring rotatable about an axis above and transverse to the direction of travel of the bag material, means including a plurality of striker bars carried by said ring or disc, across the path of travel of the bag material successively to divide the material into bag lengths, said bars engaging the bag material while moving rearwardly with respect to the forward advance of the bag material, said bars being so disposed that there is a distance of at least more than a bag length between the point of severance of the bag material by one striker bar and the point of intersection oi' the path of the advancing material by the next striker bar.

ADOLPH PO'I'DEVIN.

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